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Turbocharger whistling during acceleration

[Volvo 240, 260, 740, 760, 780, 850, 940, 960, C70, S40, S60, S60R, S70, S80, S90, V40, V70 2.3Liter Turbo 2WD, V70 2.3Liter Turbo AWD, V70 2.4Liter Turbo 2WD, V70 2.4Liter Turbo AWD, V70 2.4L non-Turbo, V70 2.5Liter non-Turbo, V70 2.5Liter Turbo 2WD, V70 2.5Liter Turbo AWD, V70R, V90, XC70, XC90]

Why does my Turbocharger Whistle during Acceleration?

Turbocharger whistling is often caused by excessive bearing wear. What generally happens is that the center section bearings tend to wear allowing the impellers to rub against the compressor housing of the Turbocharger causing a whistling during acceleration. This is not to say that all Turbochargers that whistle need to be replaced. Some Turbochargers whistle for years without failure. Frequent oil changes will help prevent Turbocharger failure!

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